[IMP] point_of_sale: no CoA error visible for pos

Problem: The error "There is no chart of accounts installed for this company..." appears for POS shop configurations
if they don't have a chart template configured for the company. It doesn't take into account if the company has its
own set of accounts so it will always show the error unless the chart template is set.

Solution: Include an additional condition to check if the company has accounting entries which is used to check
if the company has used its own set of chart of accounts for accounting.

Purpose: The error will only appear if the company has no chart template set or no accounting entries.

opw-3291399

closes odoo/odoo#119901

Signed-off-by: Laurent Smet <las@odoo.com>